Add inventory system

scripts/Items/Item.gd

@@ -0,0 +1,36 @@
+class_name Item
+	
+enum ItemCategory {
+	MEDICINE,
+	KEY_ITEM,
+	INGREDIENT
+};
+	
+func getName() -> String:
+	push_error("getName() must be overridden in derived classes");
+	return "";
+
+func isStackable() -> bool:
+	return true;
+
+func isDroppable() -> bool:
+	return true;
+
+func isSellable() -> bool:
+	return true;
+
+func getSellPrice() -> int:
+	return 0;
+
+func getBuyPrice() -> int:
+	return 0;
+
+func isConsumable() -> bool:
+	return false;
+
+func consume() -> void:
+	pass
+	
+func getCategory() -> ItemCategory:
+	push_error("getCategory() must be overriden in derived class");
+	return ItemCategory.MEDICINE;

scripts/Items/ItemStack.gd

@@ -0,0 +1,8 @@
+class_name ItemStack
+
+var item:Item;
+var quantity:int;
+
+func _init(item:Item, quantity:int = 1):
+	self.item = item;
+	self.quantity = quantity;

scripts/Items/Potion.gd

@@ -0,0 +1,13 @@
+class_name Potion extends "res://scripts/Items/Item.gd"
+
+func getName() -> String:
+	return "Potion"
+
+func getCategory() -> ItemCategory:
+	return ItemCategory.MEDICINE;
+
+func isConsumable() -> bool:
+	return true;
+
+func consume() -> void:
+	print("Consuming Potion");